Marine turbine.



KARL ALQUIST, 0F SCHENECTADY, NEW YORK.

MARINE TURBINE. v

Specification of Letters Patent.

- rasanten sepa as, reis.

- Application led August 31, 19111:. Serial No. 859,361.

' To all 'whom it may concern:

bines, of which the following is a specication.

The present invention relates toinarine turbines and particularly to such turbines simultaneously operatingl bow and stern propellers.v f`

ln steamships, more especially ferryboats, which have to berun with either end l forward, both ends being pro-vided with.'

propellers, these propellers have generally been driven -from the same shaftrng eX-` tending entirely through the boat and actuated by a reciprocating engine at an intermediate point'. It has been found, however, that this method is inefficientl as the two propellers'run at the same velocity, the forward propeller -throwing the water hard against the bow of the boat. The best eHiciency is obtained'when the forward propeller does comparatively little Work, the

main propulsive force being obtained by the stern propeller, but to effect such a distribution `of power,lit would be necessary to run the .propellers at different speeds, and this in the case of reciprocating engine drive would necessitate aseparate engine for each propeller. If, on the other hand, an ordinary turbine drive was used, it would then be necessary to provide two units, each consisting of forward and reversing portions in a well understood manner. A- larger portion of the steam would then be used in the forward portion of one of the units for operatingthe stern propeller (for the time being) and a smaller portion used for driving the forward propeller by means of the reverser. of the other unit. The boat would be thus propelled by two small turbines and as the reverser is inefficient, unless built nearly as large as the forward portion, it will easily be seen that practically four full-sized turbine rotors would be required in order to get eiicient propulsion, and the cost and weight of the machinery would be large.

AIn order to overcome the objections described, I havernade the following arrangement for driving by means of turbires, which arrangement constitutes the present invention. I dispense with separate reversing ortions inthe two units altogether and build each unit to consist of a high pres-A sure and a low pressure'portion or element,

which are so bladed that the steam tends to .revolve lthem in opposite directions.V I further connect the high pressure portion of each unit with thelow pressure portion of the other so that the steam,l after doing part of vits work in the high pressure portion Aof one unit, completes the worl in theVv 'lowv pressure portion ',of the other unit, from which it passes to the condenser. The raachinery is thus so arranged that the onehalf of the one.turbine drives one ofthe propellers,while the one-half of the other turbine drives the other propeller. The forward propeller (for the time being) is preferably suitably drivenby the high pressure portion of one turbine," giving say, 30% of the ltotal power and the then stern propeller by the low pressure portion of the other turbine, utilizing the remainder of the i power It will be understood however that my invention'is not necessarily limited to this arrangement. ABy this arrangement it will be noticed that, in addition to saving in weight and costof the machinery, the eiiiciency is also improved as the'steamacting on the two propellers from efiiciency poi-nt of view does its' work in one large turbine, and thus can give more powerthan if the same amount of steam were divided between two smaller units, as otherwise would be the case. y

In the accompanying drawing wherein have shown somewhat dagrammatically an arrangement embodying my invention, l and 1a indicate two shafts each of which drives a propeller, one propeller being at one end'of the boat and the other at the other end.

2 and 2a indicate tw'o elastic fluid turbines for driving the shafts l and 1u respectively, the turbine 2 havin'g a high pressure portion 3 and a low pressure portion 4, and the turbine 2a having a high pressure portion 3,

and a low.pressure portion 4P. TheA high' pressure and lowv pressure portions of each turbine are oppositely bladed, the low pressure portion being preferably for forward drive lof its propeller when at the stern Xand the high pressure portion for forward drive of its propeller when at the bo .v.

5 is a conduit-connected with a suitable`A source of high pressure motive fluid land l'itgs provided with a branche leading to the highV pressure vportions 3 of turbine 'and a branch 6 leading to high pressure portions 3EL of turbine 2a. Motive fluid may be directedv to either branch byvmeans ofk Jressure )ortion of one turbine driving its propeller in a 'forward direction ata time when it is a-tthebougwhile at the same time the low pressure portion of the other drives its propeller (which is then at the stern) forward. i

It -will, of course, be understood that the parts illustrated are of a more or less diagrammatic nature and only by Way of eX- ample, and that in actual practice suitable arrangements of turbine controlling valve mechanisms, etc., will be used as may be found desirable.

In accordance With the provisions ofthe patent statutes, I have described the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire'to have it understood that the apparatus shown is only illustrative, and that the invention can be carried out by other means.

What I claim as new and desire to secure byLetters Patent of the United States, is rl. The combination of two shafts, a high pressure turbine element and a low pressure turbine element connected to each shaft and Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

other.

2.' In combination, two turbines each having a high pressure portion and a low pressure portion bladed to run` in opposite directions, means'foradmitting motive fluid to the high pressure portion of either 4turbine, and conduits connecting the exhaust of the high pressure portion of each turbine to the low pressure portion of the 3. rihe combination with tivo shafts adapted to drive propellers at opposite ends of a boat, A,of a turbine for driving each shaft comprising a high pressure portion and a low pressure portion bladed to run in opposite directions, and conduit means connecting the exhaust of the high pressure portion of each turbine to the low pressure portion ofthe other.

4. The combination with two l shafts adapted to drive propellers at opposiie ends of a boat, of a high pressure turbine e ement and a low pressure turbine element connected to each shaft, each high pressure element being arranged for forward drive when its propeller is at the bow of the boat and each low pressure element being arl ranged for forward drivel when its propeller is at the stern of the boat, means for admitting high pressure motive fluid to each high pressure portion, and conduits connecting the exhaust of the high pressure-element of each shaft to the low pressure element of the other.

In witness whereof, I have hereunto set my hand this 29th day of August, 1914.

KARL ALQUIST.

lNitnesses:

HELEN ORroRD, MARGARET E. WVooLLEY.

Washington, D. G. 

